Work support for grinding machines



M. G. ZONGARO WORK SUPPORT FOR GRINDING MACHINES.

APPLlCATlON FILED SEPT-19, 1921.

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MARCO GIOVANNI ZONGABO, 0F PORTLAND, OREGON.

WORK SUPPORT FOR GRINDING- MACHINES,

Application fiIed September 19, 1921. Serial No. 501,680.

T 0 all whom it may concern: 7

Be it known that hldanco G. ZONGARO, a citizen of the United States,residing at Portland, in the county of Multnomah and State of @regon,have invented certain new and useful Improvements in lVork Supports forGrinding Machines; and I do declare the following to be afull, clear,and exact description of the invention such as will enable othersskilled in the art to which it appertains to make and use the same.

My invention relates to improvements in grinding machines and moreparticularly to those which commonly comprise an arbor and an emerywheel, used extensively in machine shop, foundries and the like, forgrinding castings. About sixty-five per cent or the 1 castings can bemore effectively ground if some form of work support is providedadjacent the periphery of the grinding wheel but on the other hand,there are a great number of castings which cannot be ground if such aworn support is permanently located adjacent said wheel, that isadjacent the periphery thereof. It is therefore the principal ob ject ofmy invention to provide a coinparatively simple and inexpensive, yet ahighly efficient and reliable work support which is attached in a uniquemanner to the usual grinding machine and which can be swung eitherdownwardly into operative position or upwardly into an inactive positionat which it will be entirely out of the'way when grinding certain formsof castings.

With the foregoing in view, the invention resides in the novelconstruction and arran ement of parts hereinafter described and claimed,the descriptive matter being supplemented by the accompanying draweings.

Figures 1 and 2 are respectively a top plan view and a side elevation ofa grindmachine equipped with my invention.

igure 3 is a detail vertical sectional view as indicated by line 3-3 ofFig. 1..

Figure i is a vertical transverse section on line 4-4: of Fig. 2.

Figure 5 is a detail horizontal section on line 5-5 of Fi 4. 7

Figures 6 and d are respectively a side elevation and an edge view ofthe mount ing and adjusting means of the work. sup port.

Figures 8 and 9 are elevations of the ad justing and mounting elementsshown in Figs. 6 and 7.

l have illustrated my invention in connection with a common type ofgrinding machine which includesa suitable basal, end plates 2 risingfrom said base and connected'by. a'longitudinal web ,3, bearings 4:supported by saidend plates and web, a driven shaft or arbor 5 rotatablymounted in the bearings, and a grinding wheel 6 on said shaft. Usually-two grinding wheels are employed, one on each end of the shaft 5, butfor purposes of illustration I have only shown one and while myinvention is disclosed only in connection with this one grinding wheel,it will be of course understood that it may if desired-be used inconnection with both wheels.

interposed between the grinding, wheel 6 and one of the end plates 2, isa flat attaching plate 7 having an opening 8 near its upper end throughwhich the shaft 5 passes rotatably, the lower end of said plate beingpreferably supported on a lug .9 formed on the end plate 2, in orderthat its weight and the weight of the parts carried thereby, will notact directly downwardly on the shaft, producing unnecessary strain orwear. I intend that the plate 7 shall have slight pivotal adjustmentaboutthe shaft 5 and for efiecting this ad screws 10 through a lateralflange 11 which is provided on one edge of said plate, said set screwsbearing against the edge of the end plate 2 so that when they are eithertightened or loosened, the'plate will swing transversely of the machine;This is desirable for a purpose which will be more apparent as thedescription proceeds.

Any'suitable means may be employed to lock the plateT inadjustedpositionand to secureittightly in place," but for this purpose I preferto pass a plurality of cap screws 12 through slots 113 in, the end plate2,. said cap screws being threaded into the plate 7 so that-when they.are tightened, this plate will be clamped tightly against the end plate2. i I Th plate 7 is by preference provlded on its outer side with anintegral boss 14 through which the opening 8 extends, and above thisboss, the upper end of the plate is cu ved. unheate t 15, 01 a lineconustment, I pass a suitable number .of set .ielow this shoulder, therear edge the p ate 7 is equipped with a laterally extending l- -shapedarm 20 by means of which a vheel guarding hood (not shown) may beattached.

Pivotally mounted on the boss 1 is a bearing 22 which 1s provided on itslower side with a transv rsely extending guide 23 of hollow formation.An arm 2st is slidably received in guide 23 and is provided on its outerend with a lateral extension constituting a work support for dispositionthe periphery of the wheel 6, and by shi' ing the arm 2a inwardly as thewheel wear down, the wor support may be at all times positioned in closeproximity to said wheel for obtaining the best results. A set screw 27may well be threaded through said guide into contact with the arm 24 inorder to look said arm in any position to which may be adjusted.

The bearing 22 is provided with a hand lever 28 which is preferablyintegral therewith and provided with oil'set ends .shown, theintermediate portion 20 of said being disposed adjacent the curved edgeof the plate 7 and being provided with an opening 30 through which aspring pressedpawl 31 passes slidably, said pawl being cooperable' withthe shoulder 18 to hold several parts in position to properly disposethe work rest 25 at the pe hery of the wheel 8. The pawl 31 also co-actswith the shoulder 17 to hold the lever 28 against novement when it israised for the purpose of positioning the work rest 25 above the wheelso that it will be entirely out of the way when grinding certain typesof cast ings. When the lever is in the last named position, itsintermediate portion 29 strikes the stop shoulder 19 so that theoperator need not have any difficulty in stopping the lever at theproper point, but need only torce s i l lever rearwardly as far aspossible, whereupon the pawl 31 is forced by its spring 32, behind theshoulder 17. l -Jhen the lever is moved forwardly, the several partsactuated thereby, are limited in moveme it by contact of the rear end ofthe guide 23 with thelower edge of the arm as seen in F 4, althor itwill be understood that any others U ble stop could be provided. I

For the purpose of releasing the'pawlgl, l mount a suitable thumb leverthe lever 28 and connect the same with said pawl in a common manner.

The device is easy to install and will be hig ily and in every waydesirable.

l-Vhen grinding castings which require the use of work support, thelever 28 is swung tit'orwardly and downwardly, thereby posh tioning therest at an operative point so as to greatly expedite the grindingoperation. However, when other forms of castings are to be ground, suchas those having concave surfaces to be reached by the grinding wheel,the lever 28 is forced rearwardly and the pawl 31 is engaged with theshoulder 17 to hold the several parts in this position. As the wheel 6wears down from continual use, the set screw 2'? is loosened and the arm29 is adjusted reaiwvardly in the guide to insure proper disposition ofthe work rest 25 with respect to the wheel 6. This having been done, theset screw 2'? is again tightened. l V henever it is necessary toslightly raise or lower the rest 25 when it is held in an operativeposition by the pawl 31, the cap screws are loose ed, the screws 10 areoperated to pivotally more the 3 7 and all parts carried thereby aboutthe shaft 5, and said cap screws are again tightened.

Since probably the best results may be obtained from the details shown,such details nay be followed, but within the scope of the invention asclaimed, numerous minor changes ma of course be made.

*laim:

L it. wor support comprising an arm adapted to l at about the arbor of agrinding wheel, said arm having a work rest, means for pivotallymounting said arm at one side of the wheel, a handle connected with saidarm for s ringing it downwardly to oper ively position the work supportor pnwa ry toniove said work suaport to an .ctive position, ans forholding said l l nd-operi-ited means on said (patrolling said holdingmeans. i work support congrising an arm assigned to pivot about thearbor (it a grindinowile-cl, said arm havii 3' a work rest, means to'votally mour iig said arm at e or the wheel, a ha d lever rigidly fromsaid arm for swinging it to move said work support to an inactiveposition, me J for holding said. ar and hand operated means on saidhandle contro ling said holding means.

8. A worlr eoinprisin adapted to pivot about the said bearing guide 01 7versely ente tron, an arm I .L l J. aoaptec to 0e o grinding wheel es" rhearing, the arm and the Work rest in a-predetermined position.

4. A work support comprising a plate having an opening to receive thearbor of 5. A work support comprising a plate having an outstandinglateral boss of cylindrical form and provided with an opening extendingthrough said boss to receive the arbor of a grinding wheel, means forsecursaid plate to a fixed part of a grinding machine of which the wheelforms a part, an arm having an opening receiving said cylindrical bosswhereby said arm may have pivotal movement upon said plate, said armbeing provided with a work rest, a hand lever rigid with said arm andcarrying a hand released pawl, and a shoulder on said plate co-o )erablewith said pawl to loclisaid lever.

6. The combination with a grinding ma chine including an arbor, agrinding wheel at one end of said arbor, a bearing spaced from saidWheel and supporting said arbor, and a vertical end plate supportingsaid bearing; of an attaching plate resting flat against said verticalend plate, one of said plates having a transverse slot, a fastenerpassing through said slot and engaging the other plate to clamp the twoplates tightly together, an adjusting screw carried by said attachingplate and engaging the edge of said end plate to pivotally adjust saidattaching plate about the arbor, a work supporting device pivotallymounted on said attaching plate, and co-acting means on said worksupporting device and said attaching plate for holding the former in apredetermined position.

In testimony whereof I have hereunto set my hand.

MARCO GIOVANNI ZONGARO

